Supertrend EMA 200 Script

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-- SPDX-License-Identifier: MIT
-- IQOptionWiki QCS Library
-- IQOW Supertrend EMA 200 v1.0.0
--
-- Supertrend (ATR trailing line) shows when the short-term trend flips. An
-- EMA 200 filter keeps only the flips that agree with the longer-term side
-- of price. Supertrend uses the same formula as the official IQ Option one.
--
-- HIGHER: Supertrend flips from down to up on a candle that closes above EMA 200.
-- LOWER:  Supertrend flips from up to down on a candle that closes below EMA 200.
--
-- Markers use the previous completed candle: they appear after the next candle
-- opens and are shifted back one bar onto the candle that qualified.
-- Educational chart tool only. It does not place trades, choose an expiry,
-- predict outcomes, or guarantee results. Test on a Practice balance first.

instrument {
    name = "IQOW Supertrend EMA 200",
    short_name = "IQOW ST EMA",
    overlay = true
}

input_group {
    "1. Supertrend",
    atr_period = input (10, "ATR period", input.integer, 1, 100),
    atr_multiplier = input (3, "ATR multiplier", input.double, 0.5, 10, 0.1, false)
}

input_group {
    "2. Trend filter",
    ema_period = input (200, "EMA period", input.integer, 2, 500)
}

input_group {
    "Display and advice",
    lines_visible = input { default = true, type = input.plot_visibility },
    signals_visible = input { default = true, type = input.plot_visibility },
    advice_enabled = input { default = false, name = "Enable platform advice", type = input.boolean }
}

input_group {
    "Colors",
    supertrend_up_color = input { default = "#25E154", type = input.color },
    supertrend_down_color = input { default = "#FF6C58", type = input.color },
    ema_color = input { default = "#FFB020", type = input.color },
    line_width = input { default = 1, type = input.line_width },
    higher_color = input { default = "#25E154", type = input.color },
    lower_color = input { default = "#FF6C58", type = input.color },
    signal_text_color = input { default = "#FFFFFF", type = input.color }
}

-- Supertrend, same recursion as the official library indicator.
band_offset = rma (tr, atr_period) * atr_multiplier
raw_up = hl2 - band_offset
raw_down = hl2 + band_offset

trail_up = iff (not na (trail_up) and close [1] > trail_up [1], max (raw_up, trail_up [1]), raw_up)
trail_down = iff (not na (trail_down) and close [1] < trail_down [1], min (raw_down, trail_down [1]), raw_down)

-- true = uptrend, false = downtrend; it keeps its last value between flips.
trend_is_up = iff (close > trail_down [1], true, iff (close < trail_up [1], false, nz (trend_is_up [1], true)))
supertrend_line = iff (trend_is_up, trail_up, trail_down)

ema_filter = ema (close, ema_period)

-- Current-bar scalars for the Lua rule logic.
local trend_now = get_value (trend_is_up, nil)
local trend_before = get_value (trend_is_up [1], nil)
local close_now = get_value (close, nil)
local ema_now = get_value (ema_filter, nil)
local trail_before = get_value (trail_up [1], nil)

-- EMA needs its full length of history before the filter means anything.
local data_is_ready =
    trend_now ~= nil and
    trend_before ~= nil and
    close_now ~= nil and
    trail_before ~= nil and
    get_value (ema_filter [ema_period], nil) ~= nil

-- Event: the trend flips on this candle, on the correct side of the EMA.
higher_setup = conditional (
    data_is_ready and trend_now and not trend_before and close_now > ema_now
)
lower_setup = conditional (
    data_is_ready and not trend_now and trend_before and close_now < ema_now
)

-- Confirm only a new setup on the previous completed candle.
confirmed_higher = conditional (
    get_value (higher_setup [1], false) and
    not get_value (higher_setup [2], false)
)

confirmed_lower = conditional (
    get_value (lower_setup [1], false) and
    not get_value (lower_setup [2], false)
)

if lines_visible then
    plot (supertrend_line, "Supertrend", get_value (trend_is_up, true) and supertrend_up_color or supertrend_down_color, line_width)
    plot (ema_filter, "EMA filter", ema_color, line_width)
end

if signals_visible then
    plot_shape (
        confirmed_higher,
        "ST EMA HIGHER",
        shape_style.triangleup,
        shape_size.small,
        higher_color,
        shape_location.belowbar,
        -1,
        "HIGHER",
        signal_text_color
    )

    plot_shape (
        confirmed_lower,
        "ST EMA LOWER",
        shape_style.triangledown,
        shape_size.small,
        lower_color,
        shape_location.abovebar,
        -1,
        "LOWER",
        signal_text_color
    )
end

-- QCS advice is a platform notification state only; it does not place trades.
if advice_enabled and
    get_value (confirmed_higher, false) and
    not get_value (confirmed_lower, false) then
    advise (advice.buy)
elseif advice_enabled and
    get_value (confirmed_lower, false) and
    not get_value (confirmed_higher, false) then
    advise (advice.sell)
else
    advise (advice.neutral)
end